Clean up some warnings (issue 25964)

pkg/analysis_server/lib/src/status/validator.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analysis_server.src.status.validator;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 404 matching lines @@
   }
 
   void _compareGenericElements(Element expected, Element actual) {
     _compareMetadata(expected.metadata, actual.metadata);
     if (expected.nameOffset != actual.nameOffset) {
       _write('Expected name offset of ');
       _write(expected.nameOffset);
       _write('; found ');
       _writeln(actual.nameOffset);
     }
-    SourceRange expectedRange = expected.docRange;
-    SourceRange actualRange = actual.docRange;
-    if (expectedRange.offset != actualRange.offset ||
-        expectedRange.length != actualRange.length) {
-      _write('Expected documentation range of ');
-      _write(expectedRange);
-      _write('; found ');
-      _writeln(actualRange);
+    String expectedComment = expected.documentationComment;
+    String actualComment = actual.documentationComment;
+    if (expectedComment != actualComment) {
+      _write('Expected documentation comment of "');
+      _write(expectedComment);
+      _write('"; found "');
+      _write(actualComment);
+      _writeln('"');
     }
   }
 
   void _compareImportElements(ImportElement expected, ImportElement actual) {
     _compareUriReferencedElements(expected, actual);
     //
     // Compare attributes.
     //
     if (expected.isDeferred != actual.isDeferred) {
       _writeMismatch(
@@ skipping 1317 matching lines @@
    * Determine whether or not there is any interesting difference between the
    * original and cloned values.
    */
   void _performComparison() {
     StringBuffer buffer = new StringBuffer();
     if (!_compareObjects(cloneValue, originalValue, buffer)) {
       description = buffer.toString();
     }
   }
 }